CA2043754A1 - Process and a device for coating engine pistons - Google Patents
Process and a device for coating engine pistonsInfo
- Publication number
- CA2043754A1 CA2043754A1 CA002043754A CA2043754A CA2043754A1 CA 2043754 A1 CA2043754 A1 CA 2043754A1 CA 002043754 A CA002043754 A CA 002043754A CA 2043754 A CA2043754 A CA 2043754A CA 2043754 A1 CA2043754 A1 CA 2043754A1
- Authority
- CA
- Canada
- Prior art keywords
- screen printing
- coating
- pistons
- process according
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 58
- 239000011248 coating agent Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007650 screen-printing Methods 0.000 claims abstract description 37
- 150000001875 compounds Chemical class 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 238000007639 printing Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims 2
- 238000005507 spraying Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 101100453921 Caenorhabditis elegans kin-29 gene Proteins 0.000 description 1
- 238000006873 Coates reaction Methods 0.000 description 1
- 101100285518 Drosophila melanogaster how gene Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001020 rhythmical effect Effects 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Screen Printers (AREA)
- Coating Apparatus (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A b s t r a c t A process and a device for coating engine pistons The coating of the cylindrical periphery of engine pistons (1) with coating compound, in particular slippery pastes, is performed by means of screen printing. The pistons (1) can be coated in the vertical position around their vertical central longitudinal axis (X) as they rotate past a screen printing stencil (2).
Fig. 2
Fig. 2
Description
2~37~
A ~r~e~;s w~ ~ (levic~e for ~o~ting moto~ ~istons ~l~he inVentiOJI relate~ to a process and a device for coatillg the cylindrical surface of engine pi~tons or slmilar with co~tillg comp~und, in partieular slippery pastes.
Such a coatlng o~' piston surfaces, which norm~lly represents a lea~, tln, grapllite or similar coating in a determined thicliness, is ~erformed with pistons so as to prevent the seizing of the pist~ns in the event of a fallure in the oil lubrication in the cylinders of an internal combustion engineand also to reduce the knocking of the engine if the coating is effected in varying thicknesses and with a varyin~ coating pattern.
Hitherto the coating of engine pistons has generally been applied by spraying, which is expensive and unsatisfactory because of high losses and low efficiency. Furthermore spraying is detriment~l to the en~ironment as large quantities of solvents are atomised.
As the peripheral surfaces of the pistons are coated via masks when spraying, no sharp contours of the coating surfaces can be re~ched. In addition the spray mist c~uses undefinable coating contours under the spraying masks which are not clo~e together. Furthermore the thic~ness of the coatin~, whicll is determlned by adjusting the spray noz~le, normally ilas large tolerances.
:~0 'l'he o~ject o~' tlle invention is therefore to create a process alld a device ~'or coating the cylindri~al periphery of englne pi~tOIlS ~r similar with coating compound, by which the a~o~e-~lelltiol-led pre~iously e~isting de~'iciencies are removed 3~ with relatively ~imple requirements with respect to the pr~cesses and stru~ture. lt should also ~e possi~le to reproduo~ tlle r~ulre~ ooatillg thic,~nes~ ~as~ on ~Ledet~rmined value~ at ~ny time for different ~i~tons.
'l'his o~ject is achieve~ as s~eoifie~ ~y the invention ~y co~ting ~eing performe~ by means of screen ~rinting.
With this s~reen printing coating a uniform coating with minimum tol~ranc,es can be rationally applied to the cy1inclrical perlpheral surfaces of engine plstons or simil~r, with every environmentally damaging emission, such as, fc,r e~am~le, solvent evaporation, being completely exc,lude~. ~ith this process lt is also possible to apply several l~yers of the same or different thicknesses on top of one another in one process sequenc,e. If the viscosity of the coatiny compound remains constant, the thickness of the COatillg 011 the peripheral surface of the piston can be predetermine~ via the quality of the woven cloth of the screen ~rinting ~tencil.
With the proc,ess specified by the invention one or several uncoated free areas can also advantageous1y ~e provided in a coated surface as lubrication bore reliefs and/or as observation ports in the form of slits, holes, recesses, strips OL- similar. Such free areas perform a double function. Firstly they serve as measurement holes or observation ~orts f or the measurement an~ consequently the monitoring of the coating thickness and secondly they im~rove tl~e lu~rication of the ~iston in normal o~eration, as they clC,t as grease ~earings. ln contrast to known sprayiny methocls, in the screen printing process s~ecifie~
~y the inventioll such free areas can simply and without great e~pelldlture ~e produced in aJly size ancl form with very precise tolerances for thickness and edge contours. 'l'his applies especially for very sma11 free areas.
~ 3~
~ith the ~rocess s~ecifie~ ~y the 'inventlon the ~lstons are expedielltly ooateci in the upright ~osition alld arc)url~ their .
:
- 2 ~
ver~ el-lt~ n~ltu~inal ~is whil~t they rot~te ~t a ~rint~ pres~ stencil whilst a~utting said ~tencil, with the seL~en pL-inting stencil also being moved in the ~iLecti~n ol rotatioll ot the ~eripheral surface of the pi~t~
~ coul-se it is also possi~le for the pistons to have a horizollt~l arrangement of the pistons for coatlng, as for e~ample in experiments and with small loads.
1() ~lhe coatln~ is advalltageously applied in a wedge shape with the coatill~ thickness decreasing at its lateral and/or upper and lowel- e~ges. As a result of this measure, hard edges or steps are avoided and the coated surface is smoother. In lS this w~y a better adaptation to the rounded shape of the piston is achieved in particular and correspondingly strong resistance is avoided. This is true in particular for the lateral edges, but this is also advantageous for the upper and lower edge with respect to the direction of movement of the piston. trhe coating compound can be brought to the screen printing stencil of the screen printing unit whilst it is continually rotated and mixed together.
The invention also relates to a device for performing the screen printing coating process, which is characterised in that it comprises one OL- several screen printing statlons each having a screen printing stencil and an applicator bla~e, up to the screen printing stencil of which the pistons to be coated in receptacles supporting them can be moved with their cylindrical peripheral surface to ~e coated, ln that the pistons with their receptacles in said position can ~e rotated around the central longitudinal axes of the pistons, with it at the same time ~eing ~osslble to entrain the printing stencil tangentially thereto and without slippillg in the directlon of rota~ion of the ~eri~her~l surface of the piston, and in that the applicator -' ' ' ' ~ 3 ~ i~ fl ~lade with its ~la~e ed~e extending parallel to the central lon~itudin~l axis o~' th~ piston to be coated is positioned o~osite the ~eri~heral surface of the piston a~utting the ~r~n ~rintiny stencil during the printing operation. 'l'he 5 pistons may ~e dis~osed so that they are upright or lying hori~ontally.
Ilowever provision will be advantageously made so that the screen printing stencil and the applicator blade extend vertically an~ that the pistons are disposed vertically on the receptacles.
The hardness o~'the blades may be adapted to the re~uired thickness of the coating to be applied. If there are provided several screen printing stations disposed one behind the other in the path of the pistons to be coated, the blades of these stations may have the same or different hardness.
In the drawings there is shown a particularly advantageous exemplified em~odiment of a coating device and a coating to be pr~duced therewith, which is described in greater detail below.
: 25 Figure 1 shows a lateral view of a coating device, l~'igure 2 shows a plan view of the coating device shown in l~'ig. 1, l~igure 3 sl-lows an exem~lifie~ em~odiment of the coating to ~e achieved with the process specifie~ by the invention and with the device ~pecified by the inventioll on the peri~heral surface of a ~iston, : 3~
l'iyure 4 shows the exem~ ied em~odiment shown in l~`iyure 3 in a position off6et by ~0 thereto, ..
.. .
~ r~L37~
l'iyure ~ shows ~n enlarge~ re~resentation o~' a perlpher~l region ~ ~ piston with ~oatiny surf~es in lateral elev~tion, l'igure ~ sh~w~ ~ rece~t~ole f~r a plston.
With the e~em~lified em~o~iment represented in the ~rawings the piSt~ su~plie~ ~y a continuously rotating conveyor ~elt l~ Wit~l thelr centr~l longitudinal a~is X vertical are rhythmic~lly removed from the conveyor belt by a rotating hea~ l~ h.,ving tongs 17, which grasp the pistons 1 in their grooves with jaws (not shown), and are transferred parallel to one an~ther via a epicyclic gear system 9, 12A, 12~, 14A, 14~ to position-controlled receptacles 18, which are dispose~ Oll a rotary table 13. The pistons 1 are held in these re~eptacles 1~ so that they cannot rotate by upwardly projecting pins 6, onto which the pistons 1 are placed, and by rotating tha rotating table 13 they are brought up one after the other by a step-by-step device to three screen printing ~tations A, ~ and C lying behind one another in the path of the pistons, in which stations they receive the predetermine~ coatings Al, B1, Cl on their cylin~rical surface one ~fter the other. The coatings are ap~lied by means o~' s~reen prlnting stencils Z, which hy means of applicatoL ~l~des lO come to tangentially a~ut the peripheral sur~ace of the pistons to be coated~ During the printing operation the pistons together with their receptacles l~ ~erform to a rotation around their central longitu~in~l axis X (Fig. ~ and 5), in which the printing stencil ~ ~an ~e entr~ine~ without sli~piny in the ~irection o~` rotation of the peripheral surf~ce o~ the pistons tangelltially thereto. 'l'he arrows in Fig. ~ show the ~ire~tion of rot~tioll and ~irection of movement o~` the peripheral suLface of the piStOIlS an~ of the s~reen printiny ' ' - ' ' , , ~ : , ~ ' ' ~tencil ~ during the pril1ting operation. ~uring thi~ the ap~licat~L ~lade remains with itS ~lade edge extending parallel to the celltral longitudinal axis X of the piston 1 t~ be coate~ o~posite the peripheral surface of the piston a~uttill~ th~ screell printing ~tencil and at the same tlme carries tlle c~ating com~ound su~lied to the upper region of the screell ~Linting ~tencil via a hose line 8 through the stellcil Lo tlle periplleral surface of the pistons.
Just one ~art of the peripheral surface of the piston can be coated, ~epending on the design of the ~creen printing stencil. Ln the exem~lified embodiment shown in Figures 3 to 5, the piston 1 is provided at its piston hea~ with a circular coating C3 by the screen printing station C and in the region of the periphery of the piston just on the sides offset to the piston pin bore 3 with coatings for coating surfaces Al, B1, Cl ~y coating stations A, B, C.
The coating surfaces shown in the exemplified embodiment are naturally only given as examples. ln many cases fewer coating surfaces are adequate. Thus, for example, only two lower coating surfaces Al may be provided, which are located opposite one another and extend over a peripheral region of ap~rox. 90 . The two coating surfaces Al may he provided as bufers, for example, for the reduction of the knocking by the engine and may have a coating thickness of 10 ~m.
Two coating surfaces Cl, which are also located opposite one another and are mutually spaced and disposed parallel to coating surfaces Al and also possi~ly coating surfaces Bl may be ~rovided in particular for emer~ency lubrlcation in the event of the failure of the normal lu~rication system.
Coating surtaces Cl (and possi~ly Bl~ may also extend over a peripheral region of 90 an~ may have a thic~ness o~ 20 3~ ~m, for e~am~le.
- , ~
/
As can ~e seen ~rom ~ uLe ~, the ~ting su~es Al, ~1 ~nd C 1 ~orm ~ we~e ~ha~e 4 at their e~es.
As can ~e seen from l~igure 3 ~n~ the enlar~ed represent~tio in ~igure 4, the ~oatin~ surfaces ~an ~e provided with small unco~ted free ~reas 5. F~r this purpose rectangular, e1li~soi~1 all~ round recesses 5, for example, are drawn in the ~oating surfaces Al and Cl. Of course further coating surfaces having correspon~ing free ~r~as may be provi~ed, lo for exam~le in the for~ of holes, s1its, strips, ellipses, ovals, circles or similar.
Graphite powder having a resinous binding agent or a resin is used as the coating compoun~ q'he following proportions have prove~ successful for the mixture:
Graphite 30 - 50 ~ by weight, preferably 40 ~
Resin 50 - 70 % by weight, preferably 60 'Q6.
The viscosity o~ the coating compound should lie within a range of from 6,~00 - 8,500 cp. Very good results are achieved with a viscosity of approximately 7,000 cp.
I'o regulate or if necessary change th~ viscosity, isopropan~1 or ethylglycol have proved to ~e successful.
The excess coating compoun~ running off the screen prin-tlng stencil is collected in a storage vat 11 locate~ under the stencil and is supplled by means of a pump 7 via a hose line ~ while ~eing contlnually mixed back to the screen printing stencil. ~y the mi~ing and the continuous supply o~ the screen printin~ compound it is possi~le to ~revent the tendellcy of the coatirlg compound to challge its viscosity ~y decompositi~
3~
After the en~ of the coatiJlg a~lication the ~la~e 10 is with~rawll fr~m the screen ~rinting stencil 2, ~s ~ result of , , whicl~ thL~ loses contact with the coated peripheral surface ol the ~ on ~o that the screen printing stencil can ~e with~rawll out of contact with the piston into its tan~ential initial ~o~ition.
~fter the coating of thP pistons has been effected in the three screen printing stations A, ~ an~ C, they are returned to the rotary head 16 and removed via its tongs 17 from the receptacles 1~ by being lifted off and conveyed on the conveyor ~elt 15 to be transported away.
, , - . . . :
-- ..... : . . :
.
A ~r~e~;s w~ ~ (levic~e for ~o~ting moto~ ~istons ~l~he inVentiOJI relate~ to a process and a device for coatillg the cylindrical surface of engine pi~tons or slmilar with co~tillg comp~und, in partieular slippery pastes.
Such a coatlng o~' piston surfaces, which norm~lly represents a lea~, tln, grapllite or similar coating in a determined thicliness, is ~erformed with pistons so as to prevent the seizing of the pist~ns in the event of a fallure in the oil lubrication in the cylinders of an internal combustion engineand also to reduce the knocking of the engine if the coating is effected in varying thicknesses and with a varyin~ coating pattern.
Hitherto the coating of engine pistons has generally been applied by spraying, which is expensive and unsatisfactory because of high losses and low efficiency. Furthermore spraying is detriment~l to the en~ironment as large quantities of solvents are atomised.
As the peripheral surfaces of the pistons are coated via masks when spraying, no sharp contours of the coating surfaces can be re~ched. In addition the spray mist c~uses undefinable coating contours under the spraying masks which are not clo~e together. Furthermore the thic~ness of the coatin~, whicll is determlned by adjusting the spray noz~le, normally ilas large tolerances.
:~0 'l'he o~ject o~' tlle invention is therefore to create a process alld a device ~'or coating the cylindri~al periphery of englne pi~tOIlS ~r similar with coating compound, by which the a~o~e-~lelltiol-led pre~iously e~isting de~'iciencies are removed 3~ with relatively ~imple requirements with respect to the pr~cesses and stru~ture. lt should also ~e possi~le to reproduo~ tlle r~ulre~ ooatillg thic,~nes~ ~as~ on ~Ledet~rmined value~ at ~ny time for different ~i~tons.
'l'his o~ject is achieve~ as s~eoifie~ ~y the invention ~y co~ting ~eing performe~ by means of screen ~rinting.
With this s~reen printing coating a uniform coating with minimum tol~ranc,es can be rationally applied to the cy1inclrical perlpheral surfaces of engine plstons or simil~r, with every environmentally damaging emission, such as, fc,r e~am~le, solvent evaporation, being completely exc,lude~. ~ith this process lt is also possible to apply several l~yers of the same or different thicknesses on top of one another in one process sequenc,e. If the viscosity of the coatiny compound remains constant, the thickness of the COatillg 011 the peripheral surface of the piston can be predetermine~ via the quality of the woven cloth of the screen ~rinting ~tencil.
With the proc,ess specified by the invention one or several uncoated free areas can also advantageous1y ~e provided in a coated surface as lubrication bore reliefs and/or as observation ports in the form of slits, holes, recesses, strips OL- similar. Such free areas perform a double function. Firstly they serve as measurement holes or observation ~orts f or the measurement an~ consequently the monitoring of the coating thickness and secondly they im~rove tl~e lu~rication of the ~iston in normal o~eration, as they clC,t as grease ~earings. ln contrast to known sprayiny methocls, in the screen printing process s~ecifie~
~y the inventioll such free areas can simply and without great e~pelldlture ~e produced in aJly size ancl form with very precise tolerances for thickness and edge contours. 'l'his applies especially for very sma11 free areas.
~ 3~
~ith the ~rocess s~ecifie~ ~y the 'inventlon the ~lstons are expedielltly ooateci in the upright ~osition alld arc)url~ their .
:
- 2 ~
ver~ el-lt~ n~ltu~inal ~is whil~t they rot~te ~t a ~rint~ pres~ stencil whilst a~utting said ~tencil, with the seL~en pL-inting stencil also being moved in the ~iLecti~n ol rotatioll ot the ~eripheral surface of the pi~t~
~ coul-se it is also possi~le for the pistons to have a horizollt~l arrangement of the pistons for coatlng, as for e~ample in experiments and with small loads.
1() ~lhe coatln~ is advalltageously applied in a wedge shape with the coatill~ thickness decreasing at its lateral and/or upper and lowel- e~ges. As a result of this measure, hard edges or steps are avoided and the coated surface is smoother. In lS this w~y a better adaptation to the rounded shape of the piston is achieved in particular and correspondingly strong resistance is avoided. This is true in particular for the lateral edges, but this is also advantageous for the upper and lower edge with respect to the direction of movement of the piston. trhe coating compound can be brought to the screen printing stencil of the screen printing unit whilst it is continually rotated and mixed together.
The invention also relates to a device for performing the screen printing coating process, which is characterised in that it comprises one OL- several screen printing statlons each having a screen printing stencil and an applicator bla~e, up to the screen printing stencil of which the pistons to be coated in receptacles supporting them can be moved with their cylindrical peripheral surface to ~e coated, ln that the pistons with their receptacles in said position can ~e rotated around the central longitudinal axes of the pistons, with it at the same time ~eing ~osslble to entrain the printing stencil tangentially thereto and without slippillg in the directlon of rota~ion of the ~eri~her~l surface of the piston, and in that the applicator -' ' ' ' ~ 3 ~ i~ fl ~lade with its ~la~e ed~e extending parallel to the central lon~itudin~l axis o~' th~ piston to be coated is positioned o~osite the ~eri~heral surface of the piston a~utting the ~r~n ~rintiny stencil during the printing operation. 'l'he 5 pistons may ~e dis~osed so that they are upright or lying hori~ontally.
Ilowever provision will be advantageously made so that the screen printing stencil and the applicator blade extend vertically an~ that the pistons are disposed vertically on the receptacles.
The hardness o~'the blades may be adapted to the re~uired thickness of the coating to be applied. If there are provided several screen printing stations disposed one behind the other in the path of the pistons to be coated, the blades of these stations may have the same or different hardness.
In the drawings there is shown a particularly advantageous exemplified em~odiment of a coating device and a coating to be pr~duced therewith, which is described in greater detail below.
: 25 Figure 1 shows a lateral view of a coating device, l~'igure 2 shows a plan view of the coating device shown in l~'ig. 1, l~igure 3 sl-lows an exem~lifie~ em~odiment of the coating to ~e achieved with the process specifie~ by the invention and with the device ~pecified by the inventioll on the peri~heral surface of a ~iston, : 3~
l'iyure 4 shows the exem~ ied em~odiment shown in l~`iyure 3 in a position off6et by ~0 thereto, ..
.. .
~ r~L37~
l'iyure ~ shows ~n enlarge~ re~resentation o~' a perlpher~l region ~ ~ piston with ~oatiny surf~es in lateral elev~tion, l'igure ~ sh~w~ ~ rece~t~ole f~r a plston.
With the e~em~lified em~o~iment represented in the ~rawings the piSt~ su~plie~ ~y a continuously rotating conveyor ~elt l~ Wit~l thelr centr~l longitudinal a~is X vertical are rhythmic~lly removed from the conveyor belt by a rotating hea~ l~ h.,ving tongs 17, which grasp the pistons 1 in their grooves with jaws (not shown), and are transferred parallel to one an~ther via a epicyclic gear system 9, 12A, 12~, 14A, 14~ to position-controlled receptacles 18, which are dispose~ Oll a rotary table 13. The pistons 1 are held in these re~eptacles 1~ so that they cannot rotate by upwardly projecting pins 6, onto which the pistons 1 are placed, and by rotating tha rotating table 13 they are brought up one after the other by a step-by-step device to three screen printing ~tations A, ~ and C lying behind one another in the path of the pistons, in which stations they receive the predetermine~ coatings Al, B1, Cl on their cylin~rical surface one ~fter the other. The coatings are ap~lied by means o~' s~reen prlnting stencils Z, which hy means of applicatoL ~l~des lO come to tangentially a~ut the peripheral sur~ace of the pistons to be coated~ During the printing operation the pistons together with their receptacles l~ ~erform to a rotation around their central longitu~in~l axis X (Fig. ~ and 5), in which the printing stencil ~ ~an ~e entr~ine~ without sli~piny in the ~irection o~` rotation of the peripheral surf~ce o~ the pistons tangelltially thereto. 'l'he arrows in Fig. ~ show the ~ire~tion of rot~tioll and ~irection of movement o~` the peripheral suLface of the piStOIlS an~ of the s~reen printiny ' ' - ' ' , , ~ : , ~ ' ' ~tencil ~ during the pril1ting operation. ~uring thi~ the ap~licat~L ~lade remains with itS ~lade edge extending parallel to the celltral longitudinal axis X of the piston 1 t~ be coate~ o~posite the peripheral surface of the piston a~uttill~ th~ screell printing ~tencil and at the same tlme carries tlle c~ating com~ound su~lied to the upper region of the screell ~Linting ~tencil via a hose line 8 through the stellcil Lo tlle periplleral surface of the pistons.
Just one ~art of the peripheral surface of the piston can be coated, ~epending on the design of the ~creen printing stencil. Ln the exem~lified embodiment shown in Figures 3 to 5, the piston 1 is provided at its piston hea~ with a circular coating C3 by the screen printing station C and in the region of the periphery of the piston just on the sides offset to the piston pin bore 3 with coatings for coating surfaces Al, B1, Cl ~y coating stations A, B, C.
The coating surfaces shown in the exemplified embodiment are naturally only given as examples. ln many cases fewer coating surfaces are adequate. Thus, for example, only two lower coating surfaces Al may be provided, which are located opposite one another and extend over a peripheral region of ap~rox. 90 . The two coating surfaces Al may he provided as bufers, for example, for the reduction of the knocking by the engine and may have a coating thickness of 10 ~m.
Two coating surfaces Cl, which are also located opposite one another and are mutually spaced and disposed parallel to coating surfaces Al and also possi~ly coating surfaces Bl may be ~rovided in particular for emer~ency lubrlcation in the event of the failure of the normal lu~rication system.
Coating surtaces Cl (and possi~ly Bl~ may also extend over a peripheral region of 90 an~ may have a thic~ness o~ 20 3~ ~m, for e~am~le.
- , ~
/
As can ~e seen ~rom ~ uLe ~, the ~ting su~es Al, ~1 ~nd C 1 ~orm ~ we~e ~ha~e 4 at their e~es.
As can ~e seen from l~igure 3 ~n~ the enlar~ed represent~tio in ~igure 4, the ~oatin~ surfaces ~an ~e provided with small unco~ted free ~reas 5. F~r this purpose rectangular, e1li~soi~1 all~ round recesses 5, for example, are drawn in the ~oating surfaces Al and Cl. Of course further coating surfaces having correspon~ing free ~r~as may be provi~ed, lo for exam~le in the for~ of holes, s1its, strips, ellipses, ovals, circles or similar.
Graphite powder having a resinous binding agent or a resin is used as the coating compoun~ q'he following proportions have prove~ successful for the mixture:
Graphite 30 - 50 ~ by weight, preferably 40 ~
Resin 50 - 70 % by weight, preferably 60 'Q6.
The viscosity o~ the coating compound should lie within a range of from 6,~00 - 8,500 cp. Very good results are achieved with a viscosity of approximately 7,000 cp.
I'o regulate or if necessary change th~ viscosity, isopropan~1 or ethylglycol have proved to ~e successful.
The excess coating compoun~ running off the screen prin-tlng stencil is collected in a storage vat 11 locate~ under the stencil and is supplled by means of a pump 7 via a hose line ~ while ~eing contlnually mixed back to the screen printing stencil. ~y the mi~ing and the continuous supply o~ the screen printin~ compound it is possi~le to ~revent the tendellcy of the coatirlg compound to challge its viscosity ~y decompositi~
3~
After the en~ of the coatiJlg a~lication the ~la~e 10 is with~rawll fr~m the screen ~rinting stencil 2, ~s ~ result of , , whicl~ thL~ loses contact with the coated peripheral surface ol the ~ on ~o that the screen printing stencil can ~e with~rawll out of contact with the piston into its tan~ential initial ~o~ition.
~fter the coating of thP pistons has been effected in the three screen printing stations A, ~ an~ C, they are returned to the rotary head 16 and removed via its tongs 17 from the receptacles 1~ by being lifted off and conveyed on the conveyor ~elt 15 to be transported away.
, , - . . . :
-- ..... : . . :
.
Claims (18)
1. A process for coating the cylindrical peripheral surface of engine pistons or similar with coating compound, in particular slippery pastes, characterised in that coating is performed by means of screen printing.
2. A process according to Claim 1, characterised in that the pistons are printed in the vertical position and around their perpendicular central longitudinal axis or in the horizontal position as they rotate past a screen printing stencil.
3. A process according to Claim 2, characterised in that the pistons are moved individually up to a screen printing unit and in the region of this unit are set in rotation around their central longitudinal axis, with the screen printing stencil of the screen printing unit being entrained during the printing operation in a straight line without slipping whilst tangentially abutting the cylindrical peripheral surface of the piston, while the blade of the screen printing unit presses the screen printing stencil against the cylindrical peripheral surface of the piston.
4. A process according to Claim 1, characterised in that in a coated surface (Al, Bl, Cl) one or several uncoated free areas (5) are provided as lubrication bore reliefs or observation ports in the form of slits, holes, recesses or strips.
5. A process according to Claim 1, characterised in that a mixture of graphite powder and a resin or a resinous binding agent is used as the coating compound.
6. A process according to Claim 5, characterised in that the proportions for the mixture are between 30 - 50 % by weight, preferably 40 % by weight, graphite powder and between 50 and 70 % by weight, preferably 60 % by weight, binding agent.
7. A process according to Claim 5, characterised in that the coating compound has a viscosity of from 6,000 to 8,500 cp, preferably approximately 7,000 cp.
8. A process according to Claim 7, characterised in that to regulate the viscosity isopropanol and/or ethylglycol are added to the coating compound as solvents.
9. A process according to Claim 1, characterised in that approximately 10 µm is specified for the thickness of the coating surface (Al) provided for a reduction in the knocking of the engine and approximately 20 µm is specified for the thickness of the coating surface (Bl, Cl) provided for emergency lubrication.
10. A process according to Claim 1, characterised in that the coating is applied in a wedge shape (4) with the coating thickness decreasing at its lateral and/or upper and lower edges.
11 11. A process according to Claim 1, characterised in that the pistons are individually supplied to the screen printing units by means of a step-by-step appliance.
12. A process according to Claim 1, characterised in that the coating compound is supplied to the screen printing stencil of the screen printing unit whilst it is continuously being rotated and mixed.
13. A process according to Claim 1, characterised in that two or more coatings of different thicknesses are applied one after the other at different positions on the cylindrical periphery of the piston in the same process sequence.
14. A device for performing the process specified by one or several of Claims 1 to 11, characterised in that it comprises one or several screen printing stations (A, B, C) each having a screen printing stencil (2) and an applicator blade (10), with it being possible to move the pistons (1) to be coated in receptacles (18) supporting them up to the screen printing stencil (2) with their cylindrical peripheral surface to be coated, in that the pistons (1) can be rotated with their receptacles (18) in said position around the central longitudinal axes (X) of the pistons, with it at the same time being possible to entrain the screen printing stencil (2) tangentially thereto and without slipping in the direction of rotation of the piston (1) to be coated, and in that the applicator blade (10) with its blade edge extending parallel to the central longitudinal axis (X) of the piston (13) to be coated is located opposite the peripheral surface of the piston abutting the screen printing stencil during the printing operation.
15. A device according to Claim 14, characterised in that the screen printing stenci1 (2) and the applicator blade (10) extend vertically and in that the pistons (2) are disposed vertically on the receptacles (18).
16. A device according to Claim 14, characterised in that the screen printing stencil (2) can be raised by withdrawing the applicator blade (10) from the cylindrical peripheral surface of the piston and in this raised position can be moved back into its initial tangentia1 position.
17. A device according to Claim 14, characterised in that beneath the screen printing stencil (2) there is disposed a storage vat (11), which is provided to collect the coating compound running off the screen printing stencil, and in that the storage vat (11) is connected to a return line (8) for the coating compound fitted with a pump (7), which is brought up to the screen printing stencil (2).
18. A device according to Claim 14, characterised in that it has several screen printing stations (A, B, C) disposed behind one another on the path travelled by the pistons (1) to be coated, in which the blades (10) have the same or different hardness as function of the thickness of the coating to be applied.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4023135A DE4023135A1 (en) | 1990-07-20 | 1990-07-20 | METHOD AND DEVICE FOR COATING ENGINE PISTON |
| DEP4023135.6 | 1990-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2043754A1 true CA2043754A1 (en) | 1992-01-21 |
Family
ID=6410704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002043754A Abandoned CA2043754A1 (en) | 1990-07-20 | 1991-06-03 | Process and a device for coating engine pistons |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US5314717A (en) |
| EP (1) | EP0466978A2 (en) |
| JP (1) | JPH05147189A (en) |
| KR (1) | KR920002919A (en) |
| CN (1) | CN1058453A (en) |
| AR (1) | AR245034A1 (en) |
| AU (1) | AU7822491A (en) |
| BR (1) | BR9103100A (en) |
| CA (1) | CA2043754A1 (en) |
| CS (1) | CS209891A3 (en) |
| DE (1) | DE4023135A1 (en) |
| HU (1) | HUT60018A (en) |
| MX (1) | MX9100269A (en) |
| PL (1) | PL290939A1 (en) |
| YU (1) | YU112491A (en) |
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| DE4240050A1 (en) * | 1992-11-28 | 1994-06-01 | Mahle Gmbh | Piston-cylinder device of an internal combustion engine |
| DE4310491A1 (en) * | 1993-03-31 | 1994-10-06 | Mahle Gmbh | Reciprocating piston of an internal combustion engine with at least partial tread reinforcement |
| US5450784A (en) * | 1993-09-28 | 1995-09-19 | Detroit Diesel Corporation | Electroplated piston skirt for improved scuff resistance |
| US5857440A (en) * | 1996-06-07 | 1999-01-12 | Melco Engraving, Inc. | Engine piston and method for its manufacture |
| KR100249958B1 (en) * | 1996-07-08 | 2000-04-01 | 이시카와 타다시 | Piston of the compressor, method of forming a coating on the piston and coating forming apparatus |
| JPH11173264A (en) * | 1997-10-09 | 1999-06-29 | Toyota Autom Loom Works Ltd | Swash plate compressor |
| DE19824859C2 (en) * | 1998-06-04 | 2002-09-26 | Ks Kolbenschmidt Gmbh | Light alloy pistons with surface reinforcement |
| JP2000120541A (en) * | 1998-10-19 | 2000-04-25 | Toyota Autom Loom Works Ltd | Piston and forming method of groove |
| JP2000170657A (en) | 1998-12-09 | 2000-06-20 | Toyota Autom Loom Works Ltd | Compressor piston and coating method therefor |
| EP1065004A4 (en) | 1999-01-14 | 2006-09-13 | Nok Kluber Co Ltd | Coating layer forming machine and method of forming it |
| GB2353739A (en) * | 1999-09-04 | 2001-03-07 | Federal Mogul Technology Ltd | Applying a low friction and low wear coating |
| DE19956148A1 (en) * | 1999-11-23 | 2001-05-31 | Werner Freudenberg | Process and screen printing machine for printing on cylindrical bodies with a helical print |
| JP2001263227A (en) * | 2000-03-21 | 2001-09-26 | Toyota Autom Loom Works Ltd | Coating film forming method in swash plate of swash plate type compressor and swash plate therefor |
| US6682778B1 (en) | 2000-04-06 | 2004-01-27 | Van Os Enterprises | Stencil to pad method for applying a coating to a part |
| DE10109277A1 (en) * | 2001-02-26 | 2002-10-24 | Manfred Schwarz | Application of a sliding layer to a bearing or support surface using conventional screen printing technology so that bearing surfaces can be applied simply and with minimal corrective work after application |
| FR2827807B1 (en) * | 2001-07-27 | 2003-10-10 | Leroux Gilles Sa | MODULAR CARD COLOR GRAPHIC PRINTING DEVICE |
| KR100448209B1 (en) * | 2001-09-17 | 2004-09-16 | 주식회사 리젠 바이오텍 | Automatic coating machine |
| US7171936B2 (en) * | 2003-10-23 | 2007-02-06 | Mahle Technology, Inc. | Piston having a patterned coating and method of applying same |
| GB2414729A (en) * | 2004-06-01 | 2005-12-07 | Atraverda Ltd | Method of producing sub-oxides with a substantially moisture free gas |
| JP2006161563A (en) * | 2004-12-02 | 2006-06-22 | Honda Motor Co Ltd | Piston of internal combustion engine |
| US7377206B2 (en) * | 2005-12-28 | 2008-05-27 | Mahle Technology, Inc. | Piston for an internal combustion engine |
| JP5042373B2 (en) * | 2010-06-28 | 2012-10-03 | 日立オートモティブシステムズ株式会社 | Piston of internal combustion engine |
| DE102010051319A1 (en) * | 2010-11-13 | 2012-05-16 | Mahle International Gmbh | Piston for an internal combustion engine |
| FR2982508B1 (en) * | 2011-11-14 | 2014-08-29 | Peugeot Citroen Automobiles Sa | METHOD FOR COATING A SERIES CHART OF REVOLUTION |
| US8651240B1 (en) | 2012-12-24 | 2014-02-18 | United Technologies Corporation | Pressurized reserve lubrication system for a gas turbine engine |
| JP6066836B2 (en) * | 2013-05-31 | 2017-01-25 | 株式会社クボタ | Engine pistons |
| CN104960324A (en) * | 2015-06-26 | 2015-10-07 | 杭州涛兴印刷设备有限公司 | Automatic printing mechanism for piston silk screen printing |
| CN105413947B (en) * | 2015-10-28 | 2018-11-20 | 芜湖市恒浩机械制造有限公司 | A kind of piston greasing device |
| CN105268598B (en) * | 2015-10-28 | 2018-07-17 | 芜湖市恒浩机械制造有限公司 | A kind of piston greasing device application device |
| CN105856809B (en) * | 2016-04-01 | 2019-07-19 | 广州九红智能装备有限公司 | A kind of intelligence multicolor screen printer |
| CN106945394A (en) * | 2017-02-28 | 2017-07-14 | 安庆雅德帝伯活塞有限公司 | A kind of automatic charging, the piston printing resin system of blanking |
| KR102689381B1 (en) * | 2018-01-31 | 2024-07-30 | 가부시끼가이샤 산쿄 세이사쿠쇼 | A lubricating device and a cam mechanism equipped with a lubricating device |
| CN109177454A (en) * | 2018-10-23 | 2019-01-11 | 卫巍 | A kind of multistation silk-screen printing device |
| CN110789995B (en) * | 2019-11-13 | 2024-02-09 | 滨州博海精工机械有限公司 | Automatic feeding and discharging device for four-station graphite printing machine |
| DE102019219445A1 (en) | 2019-12-12 | 2021-06-17 | Federal-Mogul Nürnberg GmbH | Piston and method of making the same |
| CN113333228B (en) * | 2021-05-31 | 2022-01-18 | 大昌汽车部件股份有限公司 | Piston oiling system and control method thereof |
| CN114227181A (en) * | 2021-12-31 | 2022-03-25 | 桐乡顺士达精密机械有限公司 | Machining method for automobile air conditioner compressor piston |
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| US2209688A (en) * | 1936-02-01 | 1940-07-30 | Solar Lab | Decorating machine |
| GB984204A (en) * | 1963-02-15 | 1965-02-24 | W R Foster Polyprint Ltd | Improvements in or relating to silk screen printing apparatus |
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| IT989517B (en) * | 1971-12-10 | 1975-06-10 | Produ Ag | NETWORK PRINTING MACHINE |
| FR2210936A5 (en) * | 1972-12-20 | 1974-07-12 | Dubuit Louis | |
| US4463671A (en) * | 1981-06-05 | 1984-08-07 | Rudolph Rome R | Silk-screen printing method and apparatus |
| JP2531224B2 (en) * | 1988-01-29 | 1996-09-04 | トヨタ自動車株式会社 | Film formation method on piston skirt |
| JP2681967B2 (en) * | 1988-02-12 | 1997-11-26 | トヨタ自動車株式会社 | Piston-Piston ring assembly |
| US4873951A (en) * | 1988-12-19 | 1989-10-17 | Brunswick Corporation | Connecting rod with polymeric coated sideface |
-
1990
- 1990-07-20 DE DE4023135A patent/DE4023135A1/en not_active Withdrawn
- 1990-12-20 EP EP90124892A patent/EP0466978A2/en not_active Withdrawn
-
1991
- 1991-06-03 CA CA002043754A patent/CA2043754A1/en not_active Abandoned
- 1991-06-06 AU AU78224/91A patent/AU7822491A/en not_active Abandoned
- 1991-06-26 KR KR1019910010672A patent/KR920002919A/en not_active Withdrawn
- 1991-06-26 YU YU112491A patent/YU112491A/en unknown
- 1991-07-04 PL PL29093991A patent/PL290939A1/en unknown
- 1991-07-08 CS CS912098A patent/CS209891A3/en unknown
- 1991-07-11 US US07/728,495 patent/US5314717A/en not_active Expired - Fee Related
- 1991-07-18 MX MX9100269A patent/MX9100269A/en unknown
- 1991-07-18 JP JP3202224A patent/JPH05147189A/en active Pending
- 1991-07-19 AR AR91320200A patent/AR245034A1/en active
- 1991-07-19 BR BR919103100A patent/BR9103100A/en unknown
- 1991-07-19 CN CN91104904A patent/CN1058453A/en active Pending
- 1991-07-19 HU HU912435A patent/HUT60018A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN1058453A (en) | 1992-02-05 |
| PL290939A1 (en) | 1992-06-26 |
| AR245034A1 (en) | 1993-12-30 |
| DE4023135A1 (en) | 1992-01-23 |
| HUT60018A (en) | 1992-07-28 |
| BR9103100A (en) | 1992-02-11 |
| MX9100269A (en) | 1992-02-28 |
| AU7822491A (en) | 1992-01-23 |
| KR920002919A (en) | 1992-02-28 |
| HU912435D0 (en) | 1991-12-30 |
| EP0466978A3 (en) | 1994-12-28 |
| EP0466978A2 (en) | 1992-01-22 |
| YU112491A (en) | 1994-11-15 |
| CS209891A3 (en) | 1992-02-19 |
| US5314717A (en) | 1994-05-24 |
| JPH05147189A (en) | 1993-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |